Congresswoman Judy Biggert explained why she won’t back marriage equality after a debate with her opponent, former Democratic Congressman Bill Foster.

At a press conference after a debate Wednesday night, Biggert explained that she’s “close” to supporting same-sex marriage rights, but is “not there yet.” Then she said the issue is best left to the states, equating same-sex marriage laws with the universally-accepted illegal acts of bigamy and polygamy.

“It is a state issue,” Biggert said. “We don’t have polygamy and bigamy and all of these things in the federal government. It’s the states that take care of that.”